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Goodwill and Intangible Assets - Acquired and Amortization (Details) - USD ($) $ in Thousands | Apr. 01, 2017 | Dec. 31, 2016
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Acquired identifiable intangible assets |  |
Acquired identifiable intangible assets, net of accumulated amortization | $ 11,324 | $ 2,685
Non-competition agreements |  |
Acquired identifiable intangible assets |  |
Acquired identifiable intangible assets, net of accumulated amortization | 328 | 80
Accumulated amortization | 3,865 | 3,821
Customer relationships |  |
Acquired identifiable intangible assets |  |
Acquired identifiable intangible assets, net of accumulated amortization | 10,996 | 2,605
Accumulated amortization | $ 5,524 | $ 5,181

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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